Predictive modeling of operation scenarios with negative central magnetic shear and large-radius ITBs on EAST

doi:10.1063/5.0084402

	Predictive modeling of operation scenarios with negative central magnetic shear and large-radius ITBs on EAST
	Zhang, Xuexi 1,2; Li, Guoqiang 2; Wu, Muquan 3; Tang, Tengfei 3; Liu, Xiaoju 2; Gao, Shanlu 1,2; Wu, Xiaohe 1,2; Gao, Xiang 2
刊名	AIP ADVANCES
	2022-09-01
卷号	12
DOI	10.1063/5.0084402
通讯作者	Li, Guoqiang(ligq@ipp.ac.cn)
英文摘要	Negative central magnetic shear or magnetic shear reversal is an attractive aspect for advanced operation scenarios in tokamaks as it suppresses turbulence and facilitates the formation of internal transport barriers (ITBs). The advanced operation scenario with negative magnetic shear, which is associated with high confinement quality, a large bootstrap fraction, ITBs, and so on, is one of the future goals of the experiments on EAST. In this work, modeling efforts have been made to find the operation regimes on EAST with negative central shear and large-radius ITBs. The modeling results indicate that negative central shear and large-radius ITBs can be achieved when the electron density is < n(e)>/n(G) > 0.7 and the off-axis deposited electron cyclotron heating (ECH) power is 2 MW. Additionally, scenarios with lower ECH power (similar to 1.5 MW) have been studied since at present, the maximum ECH power that can be provided on EAST is 1.5 MW. With a lower off-axis ECH power of 1.5 MW, scenarios with negative central shear and large-radius ITBs but with a higher electron density of < n(e)>/n(G) > 0.8 are obtained. The same as the first case, if the electron density is reduced to < n(e)>/n(G) = 0.8 in this case, large-radius ITBs disappeared in the predicted scenario. This reveals that high electron density and large off-axis deposited ECH power are important for scenarios that have q-profiles with negative central shear and large-radius ITBs since lower hybrid current drive (LHCD) tends to peak near the axis at lower electron density, and hence, it helps to increase the temperature gradient near the axis, which will promote bootstrap in this region, leading to a centrally peaked total current density profile. Higher off-axis deposited ECH power helps to obtain scenarios with strong negative central shear and large-radius ITBs at a lower density. Scenarios predicted in this work will guide future experiments on EAST. (C) 2022 Author(s).
资助项目	National Key R&D Program of China[2017YFE0300404] ; National Key R&D Program of China[2019YFE03040004] ; National Nature Science Foundation of China[12175277] ; National Nature Science Foundation of China[11975271] ; Shenzhen Clean Energy Research Institute
WOS关键词	ENHANCED CONFINEMENT ; PERFORMANCE ; SUSTAINMENT ; STABILITY ; REVERSAL ; PLASMAS
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Physics
语种	英语
出版者	AIP Publishing
WOS记录号	WOS:000859320100005
资助机构	National Key R&D Program of China ; National Nature Science Foundation of China ; Shenzhen Clean Energy Research Institute
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/129113]
专题	中国科学院合肥物质科学研究院
通讯作者	Li, Guoqiang
作者单位	1.Univ Sci & Technol China, Hefei 230026, Peoples R China 2.Chinese Acad Sci, Inst Plasma Phys, HFIPS, Hefei, Peoples R China 3.Shenzhen Univ, Adv Energy Res Ctr, Shenzhen 518060, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Xuexi,Li, Guoqiang,Wu, Muquan,et al. Predictive modeling of operation scenarios with negative central magnetic shear and large-radius ITBs on EAST[J]. AIP ADVANCES,2022,12.
APA	Zhang, Xuexi.,Li, Guoqiang.,Wu, Muquan.,Tang, Tengfei.,Liu, Xiaoju.,...&Gao, Xiang.(2022).Predictive modeling of operation scenarios with negative central magnetic shear and large-radius ITBs on EAST.AIP ADVANCES,12.
MLA	Zhang, Xuexi,et al."Predictive modeling of operation scenarios with negative central magnetic shear and large-radius ITBs on EAST".AIP ADVANCES 12(2022).